--- product_id: 3395119 title: "Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4\"" brand: "tjernlund" price: "€ 238.35" currency: EUR in_stock: true reviews_count: 13 category: "Tjernlund" url: https://www.desertcart.gr/products/3395119-tjernlund-m-4-metal-inline-duct-fan-200-cfm-4 store_origin: GR region: Greece --- # 120 VAC power efficiency 200 CFM airflow capacity 4-inch duct compatibility Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" **Brand:** tjernlund **Price:** € 238.35 **Availability:** ✅ In Stock ## Summary > 💨 Elevate your air game—quiet power that keeps you fresh and in control! ## Quick Answers - **What is this?** Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" by tjernlund - **How much does it cost?** € 238.35 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/3395119-tjernlund-m-4-metal-inline-duct-fan-200-cfm-4) ## Best For - tjernlund enthusiasts ## Why This Product - Trusted tjernlund brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Whisper-Quiet Power:** Experience high-pressure airflow with ultra-low noise—perfect for discreet ventilation. - • **Versatile Ventilation:** Ideal for bathrooms, spas, radon mitigation, and long duct runs requiring precision airflow. - • **Energy-Smart Operation:** Consumes just 100 watts, balancing performance with eco-conscious savings. - • **Vibration-Free Comfort:** Comes with vibration isolating foam to ensure silent, stable operation. - • **Plug & Play Convenience:** Includes power cord and wireless control compatibility for effortless setup. ## Overview The Tjernlund M-4 Metal Inline Duct Fan delivers 200 CFM of high-pressure airflow through a 4-inch duct, powered efficiently at 120 VAC and 100 watts. Designed for quiet operation with vibration isolation, it’s perfect for precise ventilation needs in bathrooms, spas, and radon mitigation setups. Easy to install with included mounting bracket and power cord, this fan blends durability with energy-smart performance. ## Description Versatile and durable the M-Series exhaust fans feature high pressure air handling performance with low noise and extremely low power usage. Simply plug the fan cord into the wireless control and plug the control into an outlet. M-series fans are ideal for long runs or air supply and exhaust applications requiring exacting performance. Use them as super quiet bathroom/spa exhausters to eliminate fogged mirrors and lingering odors. They also work great for exhausting high moisture areas such as sub-slab radon gas mitigation. Included with the fan is a strip of vibration isolating foam for a better fit and to minimize any vibration. All models come with standard power cord. Review: I couldn't tjern this down... - Anyway, this blower does an outstanding job. It's not like the el-cheapo duct boosters that you get at the big box stores. This is solidly made and has a very high rating of 400+ cfm. That may not mean much to most normal people but to give you an idea, I added this guy to a single 15 foot flex duct of 6" diameter and I swear you can dry your hair under that register. Which gets me to the point that you REALLY need to consider whether you need this Mother of all Blowers or can settle with one of the smaller birdcage blowers. Being the geek that I am, I worked with a mechanical engineer to figure out duct back pressure, nominal cfms at each register, yadda, yadda, yadda. I figured that the real number for my blower is in the area of about 300 cfm so I was pretty sure that this would be overkill. Since the install is for the second floor, I figured the drop in back pressure would help the supply plenum to load up more efficiently. As it turns out, yes and no. This guy performs so well that adding it to a single 15 foot run/one register outlet is a waste...and it will blow napkins right off your table. So my final fix will be to add a 6" wye duct adapter to split the output to two registers. All these registers supply one great room so I'm not that concerned about balancing (at least for the HVAC season). I agree that the blower can be noisy but installing the blower as far from the register completely eliminates the noise, IMO. The noise at the register is due to high pressure air meeting poorly designed registers. This is perfect for my needs, it's TOO powerful. Always a good problem to have because you can fix that - you can't do anything but start over if the blower is wimpy. I also control this with the pneumatically driven duct switch that Tjernlund makes. Works perfectly, very simple. Finally, I also installed their birdcage blower downstairs in a duct that feeds the MBR. Very good quality, a nice bump in air delivery and stone cold quiet. As they say with blowers, one good tjern deserves another. I may pressure you into buying this but don't duct out and give your life a booster right now. OK, OK it's obvious I'm a big fan... Review: Really Fine Quality Turbine - Our application is a little out of the ordinary and required a really heavy duty, well balanced turbine. Do not confuse this with the widely advertised duct fans that will not blow out a candle. This turbine will launch a sailboat. We created another victorian house solar heat system with over 100 feet of 8" duct work which needed a turbine that would A) run quiet, B) not vibrate, and C) move a lot of air. A) The noise from the fan is the air movement. There is virtually no mechanical noise from the unit. The system is in the attic turret and third floor space; it can not be heard on the second floor. B) To test the balance, we took the fan out of the box, placed it flat on the bench, and put power to it. As it spooled up to full speed, we were on all sides waiting to keep it from bouncing off the bench. Ran for about 2 minutes and did not move. C) Both on suction and pressure side it moves a tremendous amount of air. Comes with a power pigtail attached, and a sturdy mounting bracket. We mounted it on heavy rubber grommets with 3/8" bolts. One improvement that could be made would be a little wider flange for attaching duct work. A thin piece of self adhesive weather strip on the flange and then a sturdy hose clamp rather than an HVAC zip tie will keep the duct secure. A previous installation of this type required a rubber boot on both sides to keep the vibration out of the duct work. This unit is so well balanced, the duct work is directly mounted. For retrofitting exhaust fan applications, this unit will give you the option of mounting it a long way from the air source and still exchange the air adequately. As above, our application involves over 100 feet of 8" duct and it works perfectly. Also look into the Duo-Stat temperature/humidity control or the Woods Timer switches, they both work well with this fan. Manufacturer was very helpful with technical assistance and interest in our unique installation. Great turbine for many different applications! ## Features - 120 VAC - 100 Watts - 200 CFM - 4" Inlet and Outlet - Includes mounting bracket and cord ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.5 out of 5 stars 800 Reviews | ## Product Details - **Brand:** Tjernlund - **Color:** Grey - **Electric fan design:** Exhaust Fan - **Power Source:** Corded Electric - **Style:** Industrial - **Product Dimensions:** 9"D x 9"W x 9"H - **Room Type:** Bathroom - **Special Feature:** Variable Speed - **Recommended Uses For Product:** Exhausting - **Noise Level:** 200 dB ## Images ![Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" - Image 1](https://m.media-amazon.com/images/I/61UOMKKhclL.jpg) ![Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" - Image 2](https://m.media-amazon.com/images/I/51GFOzKQ8sL.jpg) ![Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" - Image 3](https://m.media-amazon.com/images/I/41fXZ4sbZFL.jpg) ![Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" - Image 4](https://m.media-amazon.com/images/I/516KERhxTcL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ I couldn't tjern this down... *by K***N on June 11, 2011* Anyway, this blower does an outstanding job. It's not like the el-cheapo duct boosters that you get at the big box stores. This is solidly made and has a very high rating of 400+ cfm. That may not mean much to most normal people but to give you an idea, I added this guy to a single 15 foot flex duct of 6" diameter and I swear you can dry your hair under that register. Which gets me to the point that you REALLY need to consider whether you need this Mother of all Blowers or can settle with one of the smaller birdcage blowers. Being the geek that I am, I worked with a mechanical engineer to figure out duct back pressure, nominal cfms at each register, yadda, yadda, yadda. I figured that the real number for my blower is in the area of about 300 cfm so I was pretty sure that this would be overkill. Since the install is for the second floor, I figured the drop in back pressure would help the supply plenum to load up more efficiently. As it turns out, yes and no. This guy performs so well that adding it to a single 15 foot run/one register outlet is a waste...and it will blow napkins right off your table. So my final fix will be to add a 6" wye duct adapter to split the output to two registers. All these registers supply one great room so I'm not that concerned about balancing (at least for the HVAC season). I agree that the blower can be noisy but installing the blower as far from the register completely eliminates the noise, IMO. The noise at the register is due to high pressure air meeting poorly designed registers. This is perfect for my needs, it's TOO powerful. Always a good problem to have because you can fix that - you can't do anything but start over if the blower is wimpy. I also control this with the pneumatically driven duct switch that Tjernlund makes. Works perfectly, very simple. Finally, I also installed their birdcage blower downstairs in a duct that feeds the MBR. Very good quality, a nice bump in air delivery and stone cold quiet. As they say with blowers, one good tjern deserves another. I may pressure you into buying this but don't duct out and give your life a booster right now. OK, OK it's obvious I'm a big fan... ### ⭐⭐⭐⭐⭐ Really Fine Quality Turbine *by K***G on November 5, 2013* Our application is a little out of the ordinary and required a really heavy duty, well balanced turbine. Do not confuse this with the widely advertised duct fans that will not blow out a candle. This turbine will launch a sailboat. We created another victorian house solar heat system with over 100 feet of 8" duct work which needed a turbine that would A) run quiet, B) not vibrate, and C) move a lot of air. A) The noise from the fan is the air movement. There is virtually no mechanical noise from the unit. The system is in the attic turret and third floor space; it can not be heard on the second floor. B) To test the balance, we took the fan out of the box, placed it flat on the bench, and put power to it. As it spooled up to full speed, we were on all sides waiting to keep it from bouncing off the bench. Ran for about 2 minutes and did not move. C) Both on suction and pressure side it moves a tremendous amount of air. Comes with a power pigtail attached, and a sturdy mounting bracket. We mounted it on heavy rubber grommets with 3/8" bolts. One improvement that could be made would be a little wider flange for attaching duct work. A thin piece of self adhesive weather strip on the flange and then a sturdy hose clamp rather than an HVAC zip tie will keep the duct secure. A previous installation of this type required a rubber boot on both sides to keep the vibration out of the duct work. This unit is so well balanced, the duct work is directly mounted. For retrofitting exhaust fan applications, this unit will give you the option of mounting it a long way from the air source and still exchange the air adequately. As above, our application involves over 100 feet of 8" duct and it works perfectly. Also look into the Duo-Stat temperature/humidity control or the Woods Timer switches, they both work well with this fan. Manufacturer was very helpful with technical assistance and interest in our unique installation. Great turbine for many different applications! ### ⭐⭐⭐⭐⭐ Superb solution to a problem *by K***D on January 30, 2014* I recently installed a new register in my family room open area. This area had an imbalance of 4 degrees from the sleeping areas. The company that installed the new register used flexible duct for the run. With 50 feet of flexible duct (not the best in transferring air) compounded with having to snake that duct around several columns, the result was a disaster. The area increased by 1 whopping degree! So my next solution to the problem was to install a regular 240 CFM inline fan. Due to having not enough room, the fan was installed near the start of the duct run. It's not the most ideal location but that was the only choice I had. Well, suffice it to say, the result was a disaster (again). The fan had no effect on the air pressure whatsoever! Why is it that adding a 240 CFM gave me no improvements? Hmm... At the end of my wits, I turned to the stronger centrifugal fans. There is this Tjernlund rated at 530 CFM and clones at 400 CFM. Needing as much air as possible, I chose the Tjernlund. Moreover, Tjernlund has a manufacturer website and instructions for the installation. Its not a difficult wiring job, but it's nice to know that a manufacturer support its products with instructions! Well, what can I say? The result was not a disaster! For whatever reason, this 530 CFM fan pushed so much air that the register pressure felt about 5-8 times stronger than the 240 CFM fan which might as well been no fan at all. So to summarize, this fan pushes 5-8x more air than the other inline fan but is only rated at 2.2x the CFM. Something is wrong and someone is lying on their stats! Since this fan was installed in the crawl space, the noise didn't bother me at all. It was about as noisy as the 240 CFM inline fan so it's actually not that loud. However, it's not quiet because air being moved around cannot be silent. I also didn't use a speed control as I needed as much force as possible. However, for short runs, this fan may be overkill without a speed control. Also, I took out the outlet plug that came with it and wired it straight to the auxiliary output on my Trane HVAC. This allowed the fan to turn on and off by call only and not stay on all the time. You do not need pressure monitor if you can hook it up to your HVAC fan control It's not often that a product works as advertised! Highly recommended! ## Frequently Bought Together - Tjernlund M-4 Metal Inline Duct Fan, 200 CFM, 4" - Tjernlund LT4 Lint Trap for DEDPV Dryer Booster Fans - Tjernlund SCP Plug-in Fan Speed Control,Brown --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/3395119-tjernlund-m-4-metal-inline-duct-fan-200-cfm-4](https://www.desertcart.gr/products/3395119-tjernlund-m-4-metal-inline-duct-fan-200-cfm-4) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-07-21*